Spectacles lens boring jig positioning device

ABSTRACT

The present invention accurately positions and affixes by a simple device and operations a drilling jig for processing non-through-holes from the edge of an edged spectacle lens toward the inside of the lens. 
     The above-mentioned lens is held and positioned using a blocking jig, which is attached to an edged spectacle lens, and, in addition, a drilling jig is positioned using a feed-set guide base and guide stopper.

BACKGROUND OF THE INVENTION

1. Field of Invention

The present invention relates to a positioning device for positioning aspectacle lens drilling jig utilized for processing a non-through-holefrom the edge of a spectacle lens toward the inside of the lens.

2. Description of Related Art

Rimless-type spectacles have been attracting attention in recent yearsdue to the advantages of a wider field of vision and lighter weight, andas a new type of this rimless spectacles, a method for forming anon-through-hole from the edge of a spectacle lens toward the inside ofthe lens, and using this non-through-hole for directly connecting to aspectacle lens, an end-piece or bridge and other such frame members isknown (Japanese Patent Laid-open No. H7-230062).

FIG. 16 shows an example of the external appearance of theabove-mentioned new type of rimless spectacles.

As shown in this figure, the above-mentioned new type of spectaclelenses connect bridge 21 and end-piece 22 to spectacle lens 1 byinserting a pair of protruding portions 23, 23 integrally formed ontoboth bridge 21 and end-piece 22 into non-through-holes 11, 11 in theedges of the lens, and affixing same in this inserted state with anadhesive or the like.

This new type rimless spectacles is advantageous in that, in comparisonto the heretofore rimless spectacles generally referred to as eithertwo-point or three-piece rimless spectacles, the screws that passcompletely through the lens surface in the thickness direction can beeliminated, thus enlarging the effective field of vision, and making thespectacles lighter weight. In addition, this new type rimless spectaclesis also advantageous in that when wiping the lenses clean, the lack ofprotrusions makes wiping easy.

To form non-through-holes 11, 11 in the edge of a spectacle lens 1, adrilling jig 3 like that shown in FIGS. 14 and 15 is utilized (JapanesePatent Laid-open No. H7-230062).

FIGS. 14 and 15 show a method for forming a non-through-hole in the edgeof a spectacle lens using a drilling jig.

FIG. 14 shows a state in which drilling jigs 3, 3 are respectivelyaffixed to both edges of spectacle lens 1. Further, FIG. 15 shows anexploded view of one portion thereof.

As shown in this figure, drilling jig 3 is shaped like a small block,and is provided with a pair of through guide holes 3l, 31. An edge ofthis drilling jig 3 is affixed to a predetermined location on an edge ofa spectacle lens using two-sided adhesive tape, and thereafter, astep-type pivot drill 33, which has a hole-depth-regulating stepdisposed on the shaft portion, is inserted into the above-mentionedthrough guide holes 31, 31 and non-through-holes 11, 11 are formed.

In accordance therewith, non-through-holes 11, 11 of the same spacing asthe spacing of the pins of the protruding portions 23, 23 of the bridge21 and end-piece 22 sides can be easily drilled without using large,expensive processing equipment, such as, for example, a numericallycontrolled general-purpose milling machine. Further, since theabove-mentioned drilling jig 3 is a small block shape, and moreover, isa small-scale and simply structured member having only a pair of throughguide holes 31, 31, it is easy to prepare types of drilling jigs 3 thatcorrespond to the different lens shapes of a spectacle lens 1. In otherwords, no matter what shape a lens 1 might be, it can be handled easilyby simply processing (cutting and forming) one edge of a drilling jig 3to match the curve of the lens edge.

However, in processing the above-mentioned non-through-holes, it was noteasy to accurately position and attach a drilling jig 3 to apredetermined drilling location on a spectacle lens edge.

As one method of doing so, there is a method whereby a chart is used andpositioning is done by visual observation. In this method, a edged lensis placed on top of a chart on which a reference line corresponding tothe shape thereof has been drawn, and using the reference line on thischart as a criteria, a drilling jig is positioned and attached to apredetermined drilling location on the edge of the lens.

However, with this method, there are cases in which a lens cannot bestably placed on a chart due to the lens shape, and further, due toerrors that occur as a result of parallax, a great deal of skill isrequired to perform this work accurately and with good repeatability.

Another method that can be considered is a method whereby a formed jigfor securing lens, which affixes an entire lens by having same fittedtherein, is used, and a drilling jig is inserted into a space formedbeforehand in a prescribed location in this fixing jig, and is attachedto the lens edge.

However, this method requires a formed jig for securing lens, which islarge enough to enclose an entire lens, and, in addition, since thisformed jig for securing lens cannot be used if the shape of the lenschanges even slightly, the problem occurs wherein extremely numeroustypes of formed jigs for securing lens must be readied. For example,even in a case in which a formed jig for securing lens has the sameshape as the curved shape of a drilling part, and the same type drillingjig can be used, if the contour shape of a portion of the lens otherthan the drilling part thereof differs even slightly, a jig thatconforms to the different contour shape thereof must be readied. In thismanner, in a method, which uses a formed jig for securing lens, theproblem occurs of not being able to handle the varied and diversepreferences of spectacle wearers.

With the foregoing problems in view, it is an object of the presentinvention to provide a positioning device for positioning a spectaclelens drilling jig, which, by its simple structure and simple operation,makes it possible to position accurately and with good repeatability adrilling jig for processing a non-through-hole from an edge of aspectacle lens toward the inside of the lens for a wide variety of lensshapes.

SUMMARY OF THE INVENTION

The invention is a positioning device for positioning a spectacle lensdrilling jig, characterized in that it comprises lens holder which holdsan edged spectacle lens affixed to a blocking jig, while determining theposition in the direction of rotation via the above-mentioned blockingjig; biaxial free moving device which freely moves the above-mentionedlens holder up-down and right-left, respectively, relative to a lenssurface in a state in which the position in the direction of rotation isfixed; a jig guide base having a guide surface on which a smallblock-shaped drilling jig is placed in a freely moving manner in thedirection of the surface; a guide stopper, which has a guide wallsurface formed as the surface for intersecting with the above-mentionedguide surface, and which comes in contact with and positions theabove-mentioned drilling jig, which is guided on the above-mentionedguide surface by this guide wall surface; and feeder which feeds theabove-mentioned jig guide base, together with the above-mentionedstopper, in the fore-aft direction relative to the above-mentioned lenssurface.

A first preferred feature of the positioning device for positioning aspectacle lens drilling jig is characterized in that it comprises amagnetically clamping device which magnetically clamps to the guide wallsurface of the guide stopper on one side of a drilling jig placed on theguide surface of the jig guide base.

A second preferred feature of the positioning device for positioning aspectacle lens drilling jig is characterized in that the guide surfaceon the jig guide base is inclined in the direction of the lens edge.

A third preferred feature of the positioning device for positioning aspectacle lens drilling jig is characterized in that the guide surfaceof the jig guide base and guide wall surface of the guide stopper areboth formed so as to be symmetrical on the right and left.

A fourth preferred feature of the positioning device for positioning aspectacle lens drilling jig is characterized in that the feeder includesa means capable of reading the numerical value of the feed position ofthe jig guide base and guide stopper.

As described above, it is possible, via a simple structure and simpleoperations, to position accurately and with good repeatability adrilling jig for processing a non-through-hole from an edge of aspectacle lens toward the inside of the lens for a wide variety of lensshapes.

In addition thereto, it is possible to make a series of operations, fromthe edging of a lens blank to a drilling process, more efficient.

In accordance therewith, it is possible to achieve the above-mentionedobject.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the drawings in which:

FIG. 1 is a simplified oblique view showing the constitution of apositioning device for positioning a spectacle lens drilling jigaccording to the present invention;

FIG. 2 is a partial cross-sectional view showing a detailed example ofthe constitution in the vicinity of lens holder of the invention;

FIG. 3 is a partial schematic diagram showing a state wherein the deviceof the invention is viewed from the top;

FIG. 4 is a partial schematic diagram showing a state wherein the deviceof the invention is viewed from the front;

FIGS. 5 and 6 are diagrams showing the state when a drilling jig ispositioned on a lens edge by the device of the present invention;

FIGS. 7 and 8 are diagrams showing another state when a drilling jig ispositioned on a lens edge by the device of the invention;

FIGS. 9, 10, 11, and 12 are oblique views showing examples of shapes ofdrilling jigs used with the device of the invention;

FIG. 13 is a flowchart describing the processing steps of a spectaclelens according to the invention;

FIGS. 14 and 15 are diagrams showing a method for forming anon-through-hole in an edge of a spectacle lens using a drilling jig;and

FIG. 16 is an oblique view showing an example of the external appearanceof a new type of rimless spectacle lens for which the frame portionswere processed using non-through-holes.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The preferred features of the invention will be explained hereinbelow byreferring to the figures.

Furthermore, the same reference numerals indicate the same or equivalentparts in each figure.

FIG. 1 is a simplified oblique view showing a positioning device forpositioning a spectacle lens drilling jig according to the invention.

The device shown in the figure is used for processing non-through-holes11, 11 from an edge of a spectacle lens 1 toward the inside of the lens,and the main portions thereof are constituted from lens holder 4,biaxial free moving device 5, a jig guide base 6, a guide stopper 62,and feeder 7.

Lens holder 4 holds an edged spectacle lens, which is mounted in ablocking jig 8, while a position in the direction of rotation (rotationabout the y-axis) is determined by the blocking jig 8 thereof.

Spectacle lenses 1 undergo edging one at a time to tailor them to thepreferences of an spectacles wearer, and the edging thereof is performedin a state wherein a plastic blocking jig 8 is affixed either bytwo-sided adhesive tape or a suction cup to a predetermined locationnear the center of the surface of a lens blank. Lens holder 4 affixes alens 1 in a constant rotational position using the blocking jig 8 towhich the lens 1 was mounted for the edging thereof.

Biaxial free moving device 5 freely moves the above-mentioned lensholder 4 up-down (along the y-axis) and right-left (along the x-axis),respectively, relative to a lens surface in a state in which theposition in the direction of rotation is fixed. This biaxial free movingdevice 5 is constituted from a vertical guide mechanism 41 for freelymoving lens holder 4 in the up-down direction (along the y-axis)relative to a lens surface, and a horizontal guide mechanism 52 forfreely moving a movable base 51, to which lens holder 4 is mounted, inthe right-left direction (along the x-axis) relative to a lens surface.

Jig guide base 6 has a jig guide surface 61 for placing a smallblock-shaped drilling jig 3 in a freely moving fashion in the directionof the surface. In the example shown in the figure, this jig guidesurface 61 is inclined in the direction of the edge of a lens 1, and, inaddition, this guide surface 61 is formed in right-left symmetricalpairs for each guide base 6.

A guide stopper 62 is either formed integrally with the above-mentionedjig guide base 6, or is bolted thereto, and has a guide wall surfaceformed as a surface for intersecting with the above-mentioned jig guidesurface 61. This guide wall surface, similar to jig guide surface 61, isformed in right-left symmetrical pairs for each guide stopper 62. Theconstitution is such that a drilling jig 3 is positioned in the fore-aftdirection (along the z-axis) by one side of the drilling jig 3, which isguided atop the above-mentioned jig guide surface 61, abutting againstthis guide wall surface.

Furthermore, the constitution is such that magnetically clamping device,such as a permanent magnet not shown in the figure, is embedded in thisguide stopper 62, and one side of a drilling jig 3 placed on theabove-mentioned guide surface 61 is magnetically clamped thereto. Inaccordance therewith, a drilling jig 3 is more securely positioned bythe guide wall surface formed by the guide stopper 62.

Feeder 7 feeds the above-mentioned jig guide base 6, together with theabove-mentioned guide stopper 62 in the fore-aft direction (along thez-axis) relative to the above-mentioned lens surface. This feeder 7 isconstituted such that precision feed rate adjustments are made possibleby using a micrometer feed mechanism 71. In this case, it is desirablethat this micrometer feed mechanism 71 be equipped with a scale,(unlabeled) shown in FIGS. 3 and 5, so as to enable this feed rate to beread directly as numerical values. Furthermore, so that backlash doesnot occur in the feed movement action resulting from the above-mentionedfeed mechanism 71, it is desirable to provide as necessary a spring forgiving the above-mentioned guide base 6 constant elastic bias in eitherthe fore or aft direction.

FIG. 2 shows an example of the detailed constitution in the vicinity oflens holder 4.

As shown in this figure, lens holder 4 is constituted from a cylindricalchuck portion 42, into which a blocking jig 8 affixed to an edged lens 1is inserted, a columnar leg portion 43 for supporting this chuck portion42, and a cylindrical cylinder portion 44 for guiding the movement ofthis leg portion 43 in the up-down direction (along the y-axis). Inaddition thereto, in the above-mentioned leg portion 43 and theabove-mentioned cylinder portion 44, there is disposed a protuberance 45and a slit 46 for mating with and guiding this protuberance only in theup-down direction so as to hold the position of rotation of the chuckportion 42 constant.

A blocking jig 8 for processing purposes is affixed via either two-sidedadhesive tape or a suction cup to a lens 1, which has just undergoneedging, and a notch portion 81 is disposed in this blocking jig 8 forpositioning in the direction of rotation. The blocking jig 8 is held bythis notch portion 81 such that the position in the direction ofrotation becomes constant.

82 is an auxiliary jig for positioning, and this auxiliary jig 82 isinserted and affixed beforehand inside the chuck portion 42.

The entire lens holder 4 described hereinabove is mounted on top of amovable base 51, and this movable base 51 is supported by a linear ballbearing so as to move freely in the right-left direction (along thex-axis).

FIG. 3 shows a state, wherein the device of the invention is viewed fromabove, and FIG. 4 shows a state, wherein the device of the invention isviewed from the front, respectively.

As shown in FIGS. 4 and 5, in a state, wherein an edged lens 1 is heldin a constant rotational position by lens holder 4, it is possible tofreely move lens holder 4 in the up-down direction (along the y-axis)and right-left direction (along the x-axis), respectively, by holdingand moving by hand the chuck portion 42 of the lens holder 4 thereof. Inaccordance therewith, the lens 1 held in lens holder 4, as shown in FIG.5, can be moved such that the edge thereof lies over the guide surface61 atop the jig guide base 6.

FIGS. 5 and 6 show the state of the invention when a drilling jig 3 ispositioned on the edge of a lens.

FIG. 5 shows the state viewed from above, and FIG. 6 shows the stateviewed from the front, respectively.

The edge of a lens 1 held in lens holder 4 is placed in a state, whereinsame overlies the jig guide surface 61 atop the jig guide base 6 byabout 1-2 millimeters.

The jig guide base 6 and guide stopper 62 are constituted eitherintegrally, or by bolt fastening, and the position of the jig guide base6 and guide stopper 62 in the fore-aft direction (along the z-axis)relative to a lens 1 on top of holder 4 is variably set by theabove-mentioned feeder 7. The feed rate for determining a position inthis fore-aft direction is determined beforehand for each type of lensshape.

By feeding jig guide base 6 and guide stopper 62 at only a predeterminedrate, it is possible to position this guide base 6 and guide stopper 62with repeatability in a predetermined position in the fore-aft direction(along the z-axis).

In this positioned state, a small block-shaped drilling jig 3 is placedon the guide surface 61 on top of the guide base 6, and one surface ofthe drilling guide (one side) is clamped to the surface (guide wallsurface) of the guide stopper 62 by a permanent magnet embedded in theguide stopper 62. Then, while pushing the jig 3 on top of theabove-mentioned guide surface 61 gently by finger, and moving same alongthe guide wall surface formed by the guide stopper 62, it is possible toposition the edge of this jig 3 on the edge of a lens. Therefore, iftwo-sided adhesive tape is attached beforehand to the edge of either oneof this jig 3 or lens 1, the drilling jig 3 can be accurately attachedand affixed to a predetermined position of a lens edge by a simplemoving operation on top of guide base 6.

As explained hereinabove, with the above-described device, it ispossible to position a drilling jig 3 relative to a lens edge accuratelyand with good repeatability for each type of lens shape thereof bydetermining beforehand for each type of lens shape of a lens 1 the shapeof the drilling jig 3 and the feed position in the fore-aft direction ofthe jig guide base 6.

FIGS. 7 and 8 show a separate state of the invention when a drilling jig3 is positioned on a lens edge.

As shown in FIG. 7, according to the curved shape of the lens edge,there are also cases in which it is difficult to match the entire edgeof this jig 3 to the edge of a lens 1 when in a state, wherein theentire side of the drilling jig 3 is exactly aligned with the guidestopper 62.

In a case such as this, as shown in FIG. 7, in a state, wherein adrilling jig 3 that is moved on top of guide surface 61 while beingaligned with guide stopper 62 first touches the edge of a lens, byrotating the jig 3 while sliding the jig 3 such that point 3 a in thefigure does not separate from guide stopper 62, as shown in FIG. 8,geometrically computable positioning can be performed beforehand even inaccordance with moving the entire edge of jig 3 to the edge of a lens.

FIGS. 9-12 show an example of a shape of a drilling jig 3 used in adevice of the invention.

As shown in FIGS. 9-12, respectively, of this figure, because eachdrilling jig 3 is an extremely simply structured part of only throughguide holes 31, 31 formed in respective simple block-shaped members, itis easy to prepare types that correspond to different lens shapes ofspectacle lenses 1. The shape of this drilling jig 3, especially theshape of the edge, is formed according to various factors, such as thethickness of a spectacle lens 1, power, the direction of curvature andangle of a lens, the shape of a lens edge, and the drilling angle intothe interior of a lens.

Further, even with lenses 1 of the same lens shape, the direction of thenon-through-holes are not always the same on the right and left of thelens 1 thereof, and, for example, there are times when the direction ofthe non-through-holes will differ on the end-piece side and the bridgeside. In this case, different types of the above-mentioned drilling jig3 must be prepared for the right and left of the lens 1, and even inthis case, as described hereinabove, since the drilling jig 3 thereforis a small block-shaped member, right-left type differences can easilybe handled.

FIG. 13 describes via flowcharting the processing steps for a spectaclelens 1 according to the invention.

As shown in this figure, in processing a spectacle lens 1, firstly, ablocking jig 8 is affixed to a lens blank with either two-sided adhesivetape or a suction cup (S1), and edging, which processes a lens contouraccording to a spectacles wearer's preference, is performed (S2). Thisedging process is performed by using a blocking jig 8 affixed to a lens1 as the position reference.

A drilling jig 3 mounting operation is performed in a state in which theedged lens 1 is affixed to the blocking jig 8 as-is (S3).

This drilling jig 3 mounting operation, as explained herein above, canbe carried out via an operation (S31) for feeding a guide base 6 andguide stopper 62 to a position set beforehand for each type of lensshape, and an operation (S32) for holding an edged lens 1 in a blockingjig 8, and an operation (S33) for matching up and bonding a drilling jig3 to a lens edge while positioning the drilling jig 3 on top of theguide surface of a guide base 6 using a guide stopper 62.

Thereafter, a step-type pivot drill is inserted into the drilling jig 3,and non-through-holes are formed in the lens edge (S4).

After the non-through-holes are formed, the drilling jig 3 and blockingjig 8 are both removed (S5), and a frame mounting process for the bridgeand end-piece is performed.

When a positioning device for positioning a spectacle lens drilling jigaccording to the invention is used here, it is possible to position andaffix a drilling jig 3 without removing a blocking jig 8, which isaffixed to the edged lens, in a state wherein the blocking jig 8 thereofis affixed as-is. Consequently, an effect, whereby the series ofoperations from the edging of a lens blank to a drilling process can bemade more efficient, is also achieved.

As explained hereinabove, the invention is a positioning device forpositioning a spectacle lens drilling jig characterized in that itcomprises the following constitution.

(1) Lens holder which holds an edged spectacle lens attached to ablocking jig, while determining the position in the direction ofrotation in accordance with the above-mentioned blocking jig.

(2) Biaxial free moving device which freely moves the above-mentionedlens holder up-down and right-left, respectively, relative to a lenssurface in a state, wherein the position in the direction of rotation isfixed.

(3) A jig guide base having a guide surface on which a smallblock-shaped drilling jig is placed in a freely moving manner in thedirection of the surface.

(4) A guide stopper, which has a guide wall surface that is formed as asurface for intersecting with the above-mentioned guide surface, andwhich makes contact with and positions the above-mentioned drilling jig,which is guided on top of the above-mentioned guide surface by thisguide wall surface.

(5) Feeder which feeds the above-mentioned jig guide base, together withthe above-mentioned stopper, in the fore-aft direction relative to alens surface.

In accordance therewith, it is possible, via a simple structure andsimple operations, to position accurately and with good repeatability adrilling jig for processing a non-through-hole from an edge of aspectacle lens toward the inside of the lens for a wide variety of lensshapes.

In addition thereto, an effect, which makes it possible for a series ofoperations, from the edging of a lens blank to a drilling process, to bemade more efficient, is also achieved.

A first preferred feature of the positioning device for positioning aspectacle lens drilling jig characterized in that it comprises amagnetically clamping device which magnetically clamps to the guide wallsurface of the guide stopper one side of a drilling jig placed on theguide surface of the jig guide base.

In accordance therewith, it is possible to more easily and smoothlyperform an operation for moving a drilling jig along the guide wallsurface of the guide stopper, while using the guide wall surface thereofto accurately position the drilling jig on top of the guide surface ofthe jig guide base.

In this case, methods such as those described hereinbelow can beconsidered for providing magnetically clamping device. That is,

(1) Embed a permanent magnet on the inside of a guide stopper, and, inaddition, as the raw material for a drilling jig, use a metal having,for example, iron, nickel or some other magnetic material as aconstituent.

(2) Form at the least the guide wall surface part of a guide stopperusing a semi-magnetic material that does not cause permanentmagnetization, and, in addition, permanently magnetize a drilling jig byforming same using a strong magnetic material that does cause permanentmagnetization.

(3) Magnetize both the guide wall surface part of a guide stopper and adrilling jig by forming the two using a semi-magnetic material, and, inaddition, cause them to make contact by either mounting in a fixedposition or embedding a permanent magnet fragment in the side of eitherone.

(4) Form both the guide wall surface part of a guide stopper and adrilling jig using a semi-magnetic material, and magnetize either one orboth only as needed using an electromagnet.

A second preferred feature of the positioning device for positioning aspectacle lens drilling jig is characterized in that the guide surfaceon top of the jig guide base is inclined in the direction of a lensedge.

In accordance therewith, matching up the edge of a drilling jig with theedge of a lens can be performed with greater accuracy and more smoothly.

In this case, shown in FIG. 6, because a blocking jig 8 is affixed tothe convex surface side of a lens 1 and the edge of the lens 1 is facingdiagonally upwards, the guide surface 61 on top of the jig guide base 6is inclined in the direction in which the guide surface 61 becomes loweras same approaches the lens edge.

However, by contrast thereto, in a case in which a blocking jig 8 isaffixed to the concave surface side of a lens 1 and the edge of the lens1 is facing diagonally downwards, the guide surface 61 on top of the jigguide base 6 can be inclined in the direction in which the guide surface61 becomes lower the farther away from the lens edge same gets.

A third preferred feature of the positioning device for positioning aspectacle lens drilling jig is characterized in that the guide surfaceof the jig guide base and guide wall surface of the guide stopper areeach formed so as to be symmetrical on the right and left.

In accordance therewith, as shown in FIGS. 3 and 4, lens holder 4 aredisposed on both sides of a central jig guide base 6, and thepositioning and affixing of drilling jigs 3 to lenses 1 being held byeach holder 4 can be performed on both sides of a single jig guide base6. In accordance therewith, it is possible to cut down the number offeeder 7 which feeds the jig guide base thereof in the fore-aftdirection, and, in addition, it is possible to lower the frequency offeed operations in accordance with feeder 7 thereof.

A fourth preferred feature of the positioning device for positioning aspectacle lens drilling jig is characterized in that the feeder includesa means capable of reading the numerical value of the feed position ofthe jig guide base and guide stopper.

In accordance therewith, an operation for setting with high precisionthe physical relationship of a jig guide base and a lens can beperformed more easily and with increased certainty.

In summary, as is clear from the above explanation, a positioning devicefor positioning a spectacle lens drilling jig according to the inventionachieves an effect such that, when positioning a drilling jig forprocessing non-through-holes toward the inside of a lens from the edgeof an edged lens affixed to a blocking jig, it is possible, via a simplestructure and simple operations, to position accurately and with goodrepeatability the abovementioned drilling jig for a wide variety of lensshapes, and furthermore, it is possible to make a series of operations,from the edging of a lens blank to a drilling process, more efficient,by holding and positioning the above-mentioned lens using theabove-mentioned blocking jig, and, in addition, positioning the drillingjig using a feed-set guide base and guide stopper.

What is claimed is:
 1. A positioning device for positioning a spectaclelens drilling jig, the device comprising: a lens holder which holds anedged spectacle lens affixed to a blocking jig, while determining theposition in the direction of rotation in accordance with said blockingjig; a biaxial free moving device which freely moves said lens holderup-down and right-left, respectively, relative to a lens surface; a jigguide base having a guide surface on which a small block-shaped drillingjig is placed in a freely moving manner parallel to the guide surface; aguide stopper, which has a guide wall surface formed as the surface forintersecting with said guide surface, and which comes in contact withand positions said drilling jig, which is guided on said guide surfaceby this guide wall surface; and a feeder which feeds said jig guidebase, together with said stopper, in the fore and aft direction relativeto said lens surface.
 2. The positioning device for positioning aspectacle lens drilling jig according to claim 1, characterized in thatthe device comprises magnetically clamping device which magneticallyclamps to said guide wall surface of said guide stopper one side of adrilling jig placed on said guide surface of said jig guide base.
 3. Thepositioning device for positioning a spectacle lens drilling jigaccording to claim 1, wherein said guide surface on top of said jigguide base is inclined in a direction where said lens is disposed. 4.The positioning device for positioning a spectacle lens drilling jigaccording to claim 1, characterized in that said guide surface of saidjig guide base and said guide wall surface of said guide stopper areboth formed so as to be symmetrical on the right and left.
 5. Thepositioning device for positioning a spectacle lens drilling jigaccording to claim 3, wherein said guide surface of said jig guide baseand said guide wall surface of said guide stopper are both formed so asto be symmetrical on the right and left.
 6. The positioning device forpositioning a spectacle lens drilling jig according to claim 2, whereinsaid guide surface on top of said jig guide base is inclined in adirection where said lens is disposed.
 7. The positioning device forpositioning a spectacle lens drilling jig according to claim 2, whereinsaid guide surface of said jig guide base and said guide wall surface ofsaid guide stopper are both formed so as to be symmetrical on the rightand left.